<?php
class Block_Admin_User_Sidebar_Search
    extends Block_Core_Grid_Sidebar_Search
{
    public function __construct()
    {
        parent::__construct();
        $this->setTitle('Management');
    }

    protected function _prepareBlock()
    {
        $object = new Object();
        $data = array('label'=>'Add new Item','title'=>'Add new Item','url'=>$this->getUrl('admin/user/view/'));
        $object->setData($data);
        $this->addButton('new', $object);

        return parent::_prepareBlock();
    }
}